I'm working on a meta-analysis, and I have a special problem regarding calculating effect size. Can anyone lend me some insight?
I have a treatment and a control group, and for each group I have the number of adverse events (not the number of people in each group experiencing the event, but the raw count of events). A single patient may experience multiple instances of the adverse event. Incidence rather than prevalence. I'm trying to figure out how to calculate effect size with this. I can't use odds-ratio because the count of adverse events is continuous and not dichotomous, and I can't use mean difference because the number of adverse events is not tracked at the level of the individual subject. Any ideas? Thanks!